Byte Count Calculator

Paste text and calculate byte size instantly. Useful for API limits, storage constraints, and payload checks.

Text input

Paste or type text to calculate total UTF-8 bytes.

Processing happens locally in your browser; nothing is uploaded.

Byte countTotal UTF-8 byte size of your input.

0 lines in0 lines outN/A runtime

Typical inputs process in under 1ms on modern browsers.

How to calculate byte count

Count in 3 steps

Takes ~5 seconds

1
Paste text
Add your content in the input area.
2
Run calculator
Click "Count bytes".
3
Use result
Use the byte total for limits, validation, or reporting.

Helpful when character count and byte size are not the same.

Who should use this tool?

Developers validating API payload limits
Teams managing UTF-8 storage constraints
Analysts checking encoded text sizes

Examples

ASCII text uses one byte per character.

Hello -> 5

Accented characters can use multiple bytes.

Aé -> 3

Emoji uses four bytes in UTF-8.

Aé😀 -> 7

Calculate UTF-8 byte size quickly

Measure exact text byte size so you can stay within payload and storage limits.

Use this byte count calculator to measure the total UTF-8 byte size of any text. Paste your content, run the count instantly, and use the result for API limits, storage planning, or QA. Everything runs locally in your browser for fast, private processing.

UTF-8 aware

Measure real byte size, including multi-byte characters.

UTF-8 counting
Fast results
No server upload

Limit checks

Validate payload size before sending text to APIs or databases.

API payload checks
Storage planning
Data QA

Privacy first: we never send your input to a server. Everything runs locally in your browser.

Byte counting tips

Use byte count when systems enforce payload size limits.

Check non-ASCII text carefully because bytes can exceed character count.
Validate limits before sending payloads to APIs.
Keep original text unchanged for repeatable checks.

Frequently asked questions

Why can byte count differ from character count?>

UTF-8 uses one to four bytes per character, so non-ASCII characters may use more than one byte.

Does this count spaces and line breaks?>

Yes. All characters, including spaces and line breaks, are included in the byte total.

Is my text sent to a server?>

No. All processing happens locally in your browser.

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